@article{fdi:010076651, title = {{G}lobal biogeographical regions of freshwater fish species}, author = {{L}eroy, {B}. and {D}ias, {M}. {S}. and {G}iraud, {E}. and {H}ugueny, {B}ernard and {J}{\'e}z{\'e}quel, {C}{\'e}line and {L}eprieur, {F}. and {O}berdorff, {T}hierry and {T}edesco, {P}ablo}, editor = {}, language = {{ENG}}, abstract = {{A}im {T}o define the major biogeographical regions and transition zones for freshwater fish species. {T}axon {S}trictly freshwater species of actinopterygian fish (i.e. excluding marine and amphidromous fish families). {M}ethods {W}e based our bioregionalization on a global database of freshwater fish species occurrences in drainage basins, which, after filtering, includes 11,295 species in 2,581 basins. {O}n the basis of this dataset, we generated a bipartite (basin-species) network upon which we applied a hierarchical clustering algorithm (the {M}ap {E}quation) to detect regions. {W}e tested the robustness of regions with a sensitivity analysis. {W}e identified transition zones between major regions with the participation coefficient, indicating the degree to which a basin has species from multiple regions. {R}esults {O}ur bioregionalization scheme showed two major supercontinental regions ({O}ld {W}orld and {N}ew {W}orld, 50% species of the world and 99.96% endemics each). {N}ested within these two supercontinental regions lie six major regions ({N}earctic, {N}eotropical, {P}alearctic, {E}thiopian, {S}ino-{O}riental and {A}ustralian) with extremely high degrees of endemism (above 96% except for the {P}alearctic). {T}ransition zones between regions were of limited extent compared to other groups of organisms. {W}e identified numerous subregions with high diversity and endemism in tropical areas (e.g. {N}eotropical), and a few large subregions with low diversity and endemism at high latitudes (e.g. {P}alearctic). {M}ain conclusions {O}ur results suggest that regions of freshwater fish species were shaped by events of vicariance and geodispersal which were similar to other groups, but with freshwater-specific processes of isolation that led to extremely high degrees of endemism (far exceeding endemism rates of other continental vertebrates), specific boundary locations and limited extents of transition zones. {T}he identified bioregions and transition zones of freshwater fish species reflect the strong isolation of freshwater fish faunas for the past 10-20 million years. {T}he extremely high endemism and diversity of freshwater fish fauna raises many questions about the biogeographical consequences of current introductions and extinctions.}, keywords = {actinopterygians ; biogeographical regions ; biogeography ; bioregionalization ; bioregions ; dispersal ; freshwater fish ; transition zones ; vicariance ; zoogeographical regions ; {MONDE}}, booktitle = {}, journal = {{J}ournal of {B}iogeography}, volume = {46}, numero = {11}, pages = {2407--2419}, ISSN = {0305-0270}, year = {2019}, DOI = {10.1111/jbi.13674}, URL = {https://www.documentation.ird.fr/hor/fdi:010076651}, }